Car-door-controlling device.



W. V. TURNER.

CAR DOOR CONTROLLING DEVICE.

APPLICATION FILED FEB. 20. ms.

Patented Mar. 18, 1919.

WalterVTumer I W W STATES PATEN FFIGE.

WALTER V. TURNER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CAR-DOOR-CONTROLLING DEVICE.

Specification of Letters Patent.

Patented Mar. 18, 1919.

Application filed February 20, 1918. Serial No. 218,358.

To all whom it may concern Be it known that I, WALTE V. TURNER, a citizen of the United States, residing at WVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Car-Door- Controlling Devices, of which the following is a specification.

This invention relates to devices for controlling the car doors of railway vehicles.

In passenger traffic, especially in subway and elevated traction service, the car doors of a train, stopping to discharge passengers, may not in all cases register with the station platform. If the doors should fail to register, the passengers are liable to step out where there is no safe alighting place and thus be exposed to accident. This might also be the case, if the doors on the wrong side of the ca-r be accidentally opened, or the doors on either side while the train is running between stations.

The principal object of my invention is to overcome the above difficulties by providing means for holding the doors locked unless the doors are in proper registry with the station platform.

In the accompanying drawing; Figure 1 is a central sectional view of an electrically controlled dOor locking mechanism embodying my invention; and Fig. 2 a diagram matic view of a car at a station, with the car door controlling apparatus applied.

According to the preferred form of my invention, an electrically controlled door locking device 1 may be provided for each door 2 of the car and comprising a piston 3 connected by a stem 4; to a door lock 5.

Fluid under pressure is supplied to and released from one side of piston 3 by the operation of a double beat valve controlled by a magnet 6. The double beat valve comprises a valve 7 for controlling the supply of fluid from a supply pipe S'through passage 9 to one side of piston 3 and a valve 10 for controlling the venting of fluid from said piston to an atmospheric exhaust port 11. The opposite side of piston 3 is open to an atmospheric port 12 and is subject to the pressure of a spring 13.

One terminal of each magnet 6 is connected to a common supply wire 14, leading to a source of current 15 and the other terminal is connected to a contact 16 adapted to engage a contact strip 17 at the station.

A common return wire 18 is connected to contacts 19 adapted to engage the contact strip 17.

In operation, when the car is running between stations, the circuits of all the magnets 6 are open, so that the magnets are deenergized and the spring 13 holds each door lock 5 in locking engagement with the door 2, thus preventing the opening of the door.

When the car enters a station, if the car is in full registry, then all the contacts 16 and 19 will engage the contact strip 17 at the unloading side of the car, so as to close the respective circuits for each magnet 6 at that side of the car, and the double beat valve is then operated to close valve 10 and open the valve 7 so that fluid under pressure is supplied to each piston 3. The door lock 5 is thereupon actuated to release the door 2, permitting the same to be opened in the usual manner.

If the car fails to fully register with the station platform, for example, as shown in Fig. 2 of the drawing, the contact 16 of the device 1 which controls the door 2 not in registry, will not engage the contact strip 17 and consequently, this door will remain locked, since its magnet 6 will not be energized.

The doors 2 which register with the station platform, however, all have their magnets 6 energized, so that these doors will be unlocked, permitting the same to be opened. The doors on the opposite side of the car will also remain locked, since the controlling contacts are not in engagement with the station contact strip.

In case of accident or stoppage of a car between stations, it may be necessary to open the doors and in order to provide for this contingency, a normally open emergency switch 20 may be arranged so as to operate normally for closing the circuit of each magnet 6, a switch being preferably provided for each magnet circuit, though only one of these switches is shown in the drawing.

Where the opening and closing of the car doors is controlled electrically the electric circuit for the door operating devices may be employed as the circuit for the automatic door locking devices.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. The combination with a car door, of an electrically controlled device for normally locking the door and a contact device at a station for controlling the circuit of said door locking device.

2. The combination with a car door, of an electrically controlled device on a normally open electric circuit for locking the door andv a contact device at a station for closing the circuit of said locking device to effect the release of the door.

3. The combination with a car door, of a fluid operated piston device for normally locking the door, a magnet controlledvalve device-for varying the fluid pressureon said piston, and a contact device at a station for controlling the circuit of said magnet controlled valve device.

electrically controlled device. adapted to lock the door when its electric circuit is open, a

contact device at a station for closing said circuit, and a normall open manually operated switch for closlng thecircuit in an emergency. I I x In testimonywhereof Ihave hereunto set my hand. r

WALTER V. TURNER.

Copies of this patent may be obtained for five c'ents"ea.ch', by addressing the" Commissioner of Patents, Washington, D. G. 

